CN110975525A - Production method for effectively reducing emission of dust and sulfur dioxide in flue gas of alkali recovery furnace - Google Patents
Production method for effectively reducing emission of dust and sulfur dioxide in flue gas of alkali recovery furnace Download PDFInfo
- Publication number
- CN110975525A CN110975525A CN201911075287.3A CN201911075287A CN110975525A CN 110975525 A CN110975525 A CN 110975525A CN 201911075287 A CN201911075287 A CN 201911075287A CN 110975525 A CN110975525 A CN 110975525A
- Authority
- CN
- China
- Prior art keywords
- dust
- flue gas
- concentration
- emission
- sulfur dioxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Paper (AREA)
Abstract
The invention discloses a production method for effectively reducing the emission of dust and sulfur dioxide in flue gas of a soda recovery furnace, which comprises the following steps: (1) the black liquid super-concentration technology comprises the following steps: the thickening crystallization effect is increased, and the black liquor concentration is improved; an ultra-concentrated combustion technology is adopted, an air supply system of the alkali furnace is changed, and stable and efficient combustion is realized; (2) the dust remover technology comprises the following steps: on the premise of a dry electric precipitator, a wet electric precipitator is additionally arranged to remove dust in a synergic manner, so that the dust concentration in the flue gas is reduced; (3) the technology for desulfurizing the dilute white liquor comprises the following steps: the wet electric dust remover adds causticized dilute white liquid as circulating liquid to absorb SO in the flue gas2Further reducing SO2The amount of discharge of (c). Compared with the national requirement on the flue gas emission standard of an alkali recovery boiler: SO (SO)2The discharge concentration is not higher than 200mg/Nm3Dust emission concentration is not higher than 20mg/Nm3Compared with technically improved SO2And dust, achieves the aim of ultralow emission, and has good social and ecological benefits.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of alkali recovery, in particular to a production method for effectively reducing the emission of dust and sulfur dioxide in flue gas of an alkali recovery furnace.
[ background of the invention ]
In the pulping process of sulfate (alkaline process), about 40-50% of organic matters in the fiber raw material are dissolved in the boiled alkali liquor to form black liquor. The main components of these inorganic substances are sodium salt combined with organic substances, free NaOH and Na2CO3、Na2S、Na2SO4And so on. Can produce 10m per ton of chemical pulp3Black liquor, with solids content of about 1.2-1.7 tons, is a source of pollution. The purpose of alkali recovery is to remove the alkali from the black liquorThe sodium salt is converted into NaOH and reused for cooking, thus reducing the consumption of alkali and the pollution to water area, namely alkali recovery.
With the environmental protection importance of China, the standard of the emission of flue gas is more and more strict, and SO is introduced in the production process2、NOXAnd dust and other pollutants are discharged into the atmosphere, thus causing environmental pollution. The national emission standard of flue gas of an alkali recovery boiler is as follows: NOXThe discharge concentration is not higher than 200mg/Nm3，SO2The discharge concentration is not higher than 200mg/Nm3Dust emission concentration is not higher than 20mg/Nm3. In the production, an ultra-concentrated black liquid technology, a wet electric precipitator technology and a dilute white liquid desulfurization technology are adopted, the dust removal and desulfurization effects are obvious, and the production method is a production method for effectively reducing the emission of dust and sulfur dioxide in the flue gas of the alkali recovery furnace.
[ summary of the invention ]
The invention aims to provide a production method for effectively reducing the emission of dust and sulfur dioxide in the flue gas of a soda recovery furnace, which aims to solve the problem that the emission of the dust and the sulfur dioxide in the flue gas of the soda recovery furnace does not reach the standard.
In order to achieve the technical purpose, the design scheme of the invention is as follows:
a production method for effectively reducing the emission of dust and sulfur dioxide in flue gas of a soda recovery furnace comprises the following steps:
(1) the black liquid super-concentration technology comprises the following steps: the thickening crystallization effect is increased, and the black liquor concentration is improved; an ultra-concentrated combustion technology is adopted, an air supply system of the alkali furnace is changed, and stable and efficient combustion is realized;
(2) the dust remover technology comprises the following steps: on the premise of a dry electric precipitator, a wet electric precipitator is additionally arranged to remove dust in a synergic manner, so that the dust concentration in the flue gas is reduced;
(3) the technology for desulfurizing the dilute white liquor comprises the following steps: the wet electric dust remover adds causticized dilute white liquid as circulating liquid to absorb SO in the flue gas2Further reducing SO2The amount of discharge of (c).
Further, the concentration of the black liquor is increased to more than 72% in the step (1).
Further, in the air supply system in the step (1), cross air inlet is performed on the front wall and the rear wall by secondary air.
Further, the wind is hot wind.
Further, the temperature of the hot air is 150 ℃.
Further, the dust removal technology in the step (2) is a wet electric dust remover technology.
Furthermore, the wet electric dust collector adopts a single chamber and double electric fields, and each electric field consists of 208 anode plates with the length of 6 meters and a polar line.
Further, the flow velocity of flue gas in each electric field is 2.5-3 m/s.
Further, in the step (2), the dust concentration in the flue gas is reduced to 20mg/Nm3The following.
Further, the concentration of the causticized dilute white liquor in the step (3) is 20 mg/l.
By the technical scheme of the invention, the following effects can be realized:
(1) the ultra-concentrated technology effectively improves the temperature of the hearth cushion layer, enhances the volatilization of Na in the cushion layer at high temperature, and leads the Na to be in contact with SO2Reaction to form Na2SO4Reduction of SO2Discharging;
(2) the multi-layer air supply system remarkably reduces the flow velocity of flue gas, eliminates the 'channeling' of the flue gas in the hearth, enhances the mixing of wind and the flue gas, and increases the residence time of the flue gas, thereby reducing the emission of TRS and reducing the loss of the hearth;
(3) the wet electric dust collector effectively adsorbs dust in the flue gas, further reduces the dust concentration in the flue gas, and even achieves ultra-low emission;
(4) the dilute white liquid desulfurization technology further absorbs sulfur dioxide in the flue gas, and the dilute white liquid is sourced from the causticization working section, so that the sulfur dioxide is absorbed, and the value of the dilute white liquid is effectively exerted;
(5) the dust recovered from the flue gas is dissolved in circulating water and returned to the dissolving tank of the alkali furnace, so that the alkali component in the dust is recycled, and the alkali recovery rate of the alkali furnace is improved;
(6) compared with the national requirement of the flue gas emission standard of the alkali recovery boiler: SO (SO)2The discharge concentration is not higher than 200mg/Nm3Dust emission concentration is not higher than 20mg/Nm3Compared with technically improved SO2And dust, achieves the aim of ultralow emission, and has good social and ecological benefits.
[ detailed description ] embodiments
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
The production method for effectively reducing the emission of dust and sulfur dioxide in the flue gas of the alkali recovery furnace comprises the following steps:
(1) the black liquid super-concentration technology comprises the following steps: the thickening crystallization effect is increased, and the concentration of the black liquor is increased to more than 72%; the alkali furnace air supply system is changed by adopting an ultra-concentrated combustion technology, the air supply system adopts cross air inlet of front and rear walls of secondary air, the secondary air adopts hot air, the temperature is 150 ℃, and stable and efficient combustion is realized. The ultra-concentrated technology effectively improves the temperature of the hearth cushion layer, enhances the volatilization of Na in the cushion layer at high temperature, and leads the Na to be in contact with SO2Reaction to form Na2SO4Reduction of SO2And (5) discharging.
(2) Wet electric dust collector technology: under the premise of a dry electric dust remover, a wet electric dust remover is additionally arranged for removing dust in a coordinated manner, so that the dust concentration in the flue gas is reduced to 20mg/Nm3The wet electric dust collector adopts a single-chamber double-electric field, each electric field consists of 208 anode plates with the length of 6 meters and a polar line, and the flow velocity of flue gas in each electric field is 2.5-3 m/s;
(3) the technology for desulfurizing the dilute white liquor comprises the following steps: adding a causticized dilute white liquid as a circulating liquid into a wet electric precipitator, wherein the concentration of the causticized dilute white liquid is 20mg/l, and the causticized dilute white liquid absorbs SO in flue gas2Further reducing SO2The amount of discharge of (c).
The present invention is illustrated by the following more specific examples.
Dissolving basic raw materials of black liquor by using softwood with the concentration of 13% and the temperature of 75 ℃; evaporating and concentrating by I, II, III, IV, V and VI effect of evaporatorThe concentration is more than 60 percent, and the density is 1.33t/m3The concentrated black liquor of (2); pumping the effective concentrated black liquor from a concentrated black liquor tank to an alkali ash mixing tank of an alkali furnace, mixing the effective concentrated black liquor with alkali ash to form black liquor with the concentration of more than 60% and the temperature of more than 120 ℃, and then sending the black liquor into the concentrated black liquor tank; pumping crystallization and thickening effect for crystallization and evaporation, evaporating to form super-concentrated black liquor with the concentration of more than 72% and the temperature of 130-; finally, the mixture is sent into an alkali furnace from a super-concentrated black liquor tank for combustion. The method has a problem of alkali ash mixing proportion, theoretically speaking, the alkali ash is added into the concentrated black liquor of about 55 percent of the conventional evaporation system, the concentrated black liquor is sent back to a concentrated black liquor tank after the concentration of the alkali ash is directly measured to rise by 2 to 3 percent, and the alkali ash enters a crystallization effect evaporator to be thickened to about 72 percent to be effective, so that the purpose of crystallization thickening is achieved. In actual operation, the alkali ash of the alkali furnace is uniformly added into the alkali ash mixing tank, so that the requirement of normal operation can be met. If the amount of the soda ash is relatively large due to the washing effect of the evaporator, the soda ash can be added into the soda ash mixing tank completely, but the adding amount is uniform, and the time of the crystallization effect cycle is shortened. In conclusion, the ratio of the alkali ash to be added is adjusted in the actual production in order to achieve the best production. The air supply system adopts a first air supply system, a second air supply system and a third air supply system, wherein secondary air adopts a staggered air inlet mode of a front wall and a rear wall, and the secondary air adopts hot air with the temperature of 150 ℃.
The flue gas that the alkali stove produced gets into wet-type electrostatic precipitator cooling tower cooling after dry-type electrostatic precipitator removes dust, gets into wet-type electrostatic precipitator electric field again, and the dust is adsorbed by the polar plate, washes and gets into circulation basin, sends into alkali stove dissolving tank. The scheme adopts a plate-type wet electric dust collector which is a single-chamber double-electric-field dust collector, each electric field consists of 208 anode plates with the length of 6 meters and a polar line, and the flow velocity of internal flue gas is 2.5-3 m/s.
Sending the causticized dilute white liquid with the concentration of 20mg/l into a circulating water tank of a wet electric dust collector from a dilute white liquid tank of a causticization working section, pumping the circulating water tank into a cooling tower of the wet electric dust collector by a pump, fully mixing the circulating water tank with the flue gas, and absorbing SO in the flue gas by alkali components in the dilute white liquid2And sodium sulfite is formed and recovered to the system.
By this production method, in flue gasThe dust concentration is 19.96mg/Nm3Down to 7.2mg/Nm3，SO2The discharge concentration is 154.5mg/Nm3Down to 3mg/Nm3Effectively reduces the emission of dust and sulfur dioxide in the flue gas of the alkali recovery furnace, and the data before and after modification are shown in the following table 1.
TABLE 1 comparison of data before and after transformation
As is clear from Table 1, the dust concentration after modification was 7.2mg/Nm3The dust removal rate reaches 63.73%; SO (SO)2The concentration is 3mg/Nm3Removing SO2The rate reaches 98.06 percent, thus effectively solving the problem that the emission of dust and sulfur dioxide in the flue gas of the alkali recovery furnace does not reach the standard. Compared with the national requirement of the flue gas emission standard of the alkali recovery boiler: SO (SO)2The discharge concentration is not higher than 200mg/Nm3Dust emission concentration is not higher than 20mg/Nm3Compared with technically improved SO2And dust, achieves the aim of ultralow emission, and has good social and ecological benefits.
The above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention, so that the changes and modifications made by the claims and the specification of the present invention should fall within the scope of the present invention.
Claims (10)
1. A production method for effectively reducing the emission of dust and sulfur dioxide in flue gas of a soda recovery furnace is characterized by comprising the following steps:
(1) the black liquid super-concentration technology comprises the following steps: the thickening crystallization effect is increased, and the black liquor concentration is improved; an ultra-concentrated combustion technology is adopted, an air supply system of the alkali furnace is changed, and stable and efficient combustion is realized;
(2) the dust remover technology comprises the following steps: on the premise of a dry electric precipitator, a wet electric precipitator is additionally arranged to remove dust in a synergic manner, so that the dust concentration in the flue gas is reduced;
(3) the technology for desulfurizing the dilute white liquor comprises the following steps: the wet electric dust remover adds causticized dilute white liquid as circulating liquid to absorb SO in the flue gas2Further decreaseSO2The amount of discharge of (c).
2. The process of claim 1, wherein the black liquor concentration in step (1) is increased to above 72%.
3. The method for effectively reducing the emission of dust and sulfur dioxide in flue gas of a soda recovery furnace according to claim 1, wherein the air supply system in step (1) adopts cross air supply of secondary air from front and rear walls.
4. The method of claim 3, wherein the air is hot air.
5. The method of claim 4, wherein the hot blast is at a temperature of 150 ℃.
6. The production method for effectively reducing the emission of dust and sulfur dioxide in the flue gas of the soda recovery furnace according to claim 1, wherein the dust removal technology of step (2) is a wet electric dust remover technology.
7. The production method for effectively reducing the emission of dust and sulfur dioxide in the flue gas of a soda recovery furnace according to claim 6, wherein the wet electric dust collector adopts a single chamber and double electric fields, and each electric field consists of 208 anode plates with the length of 6 meters and a polar line.
8. The production method for effectively reducing the emission of dust and sulfur dioxide in the flue gas of a soda recovery furnace according to claim 7, wherein the flow velocity of the flue gas in each electric field is 2.5-3 m/s.
9. The method of claim 1 for effectively reducing the content of flue gas of a soda recovery furnaceThe production method of dust and sulfur dioxide emission is characterized in that the dust concentration in the flue gas is reduced to 20mg/Nm in the step (2)3The following.
10. The process of claim 1, wherein the concentration of the causticized white liquor in step (3) is 20 mg/l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911075287.3A CN110975525A (en) | 2019-11-06 | 2019-11-06 | Production method for effectively reducing emission of dust and sulfur dioxide in flue gas of alkali recovery furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911075287.3A CN110975525A (en) | 2019-11-06 | 2019-11-06 | Production method for effectively reducing emission of dust and sulfur dioxide in flue gas of alkali recovery furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110975525A true CN110975525A (en) | 2020-04-10 |
Family
ID=70083241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911075287.3A Pending CN110975525A (en) | 2019-11-06 | 2019-11-06 | Production method for effectively reducing emission of dust and sulfur dioxide in flue gas of alkali recovery furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110975525A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847819A (en) * | 2021-09-28 | 2021-12-28 | 福建省青山纸业股份有限公司 | Energy-saving and consumption-reducing combustion process for alkali recovery medium-pressure furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5344447B2 (en) * | 2007-10-17 | 2013-11-20 | 独立行政法人産業技術総合研究所 | Gasification system that reuses alkali evaporated in gasification furnace |
| CN108380017A (en) * | 2018-02-11 | 2018-08-10 | 浙江天蓝环保工程有限公司 | A kind of alkali kiln gas wet denitration technique that absorbent recycles and device |
| CN207822768U (en) * | 2018-01-02 | 2018-09-07 | 日照华泰纸业有限公司 | A kind of desulfurized dust collection column and alkali kiln gas desulfurization dust-removal system with silk screen |
| CN109550341A (en) * | 2018-11-21 | 2019-04-02 | 浙江菲达环保科技股份有限公司 | Alkali recovery furnace flue gas minimum discharge device and flue gas processing method |
| CN109622222A (en) * | 2018-11-21 | 2019-04-16 | 浙江菲达环保科技股份有限公司 | Alkali recovery furnace flue gas high effect dust cleaner and dust removal method |
-
2019
- 2019-11-06 CN CN201911075287.3A patent/CN110975525A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5344447B2 (en) * | 2007-10-17 | 2013-11-20 | 独立行政法人産業技術総合研究所 | Gasification system that reuses alkali evaporated in gasification furnace |
| CN207822768U (en) * | 2018-01-02 | 2018-09-07 | 日照华泰纸业有限公司 | A kind of desulfurized dust collection column and alkali kiln gas desulfurization dust-removal system with silk screen |
| CN108380017A (en) * | 2018-02-11 | 2018-08-10 | 浙江天蓝环保工程有限公司 | A kind of alkali kiln gas wet denitration technique that absorbent recycles and device |
| CN109550341A (en) * | 2018-11-21 | 2019-04-02 | 浙江菲达环保科技股份有限公司 | Alkali recovery furnace flue gas minimum discharge device and flue gas processing method |
| CN109622222A (en) * | 2018-11-21 | 2019-04-16 | 浙江菲达环保科技股份有限公司 | Alkali recovery furnace flue gas high effect dust cleaner and dust removal method |
Non-Patent Citations (2)
| Title |
|---|
| 刘秉钺编著: "《热工基础与造纸节能（第二版）》", 31 January 2010, 北京：中国轻工业出版社 * |
| 邹运通: ""湿式电除尘器在碱回收炉烟气治理中的应用"", 《中华纸业》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847819A (en) * | 2021-09-28 | 2021-12-28 | 福建省青山纸业股份有限公司 | Energy-saving and consumption-reducing combustion process for alkali recovery medium-pressure furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101579602B (en) | Energy-saving and high-quality ammonia desulphurization process for ammonia sulfate recovery | |
| CN100443412C (en) | Method for treating tail gas and waste water from rare earth finished ore acid method burning process | |
| CN106396432B (en) | A kind of method of pulping and paper-making white clay recycling active lime | |
| CN101757844B (en) | Method and device for performing flue gas desulfurization by using ammonia process | |
| CN101585617B (en) | Process for treating chemical fiber cotton pulp black liquor | |
| CN111974182A (en) | Novel high-efficient waste heat retrieval and utilization and flue gas take off white integrated device | |
| CN101402475A (en) | Process for producing magnesium oxide/absorbent charcoal composite material and uses thereof | |
| CN102423608A (en) | Desulfurizer prepared by causticized white mud and method thereof for flue gas desulphurization | |
| CN111072091A (en) | System and method for treating desulfurization wastewater by using flue gas waste heat | |
| CN112607945A (en) | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment | |
| CN110975525A (en) | Production method for effectively reducing emission of dust and sulfur dioxide in flue gas of alkali recovery furnace | |
| CN1067080A (en) | The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp | |
| CN102423615A (en) | Desulfurization system and method for processing flue gas of glass melting furnace | |
| CN106215626A (en) | A kind of high atomization flue gas desulfurization processing method | |
| CN103691259A (en) | Energy-saving and water-saving purification system for processing smoke by using wet process and energy-saving and water-saving purification process | |
| CN102337690B (en) | Pulping method for stewing bamboo material by using aluminum salt and retaining silicon at same time | |
| CN115569479A (en) | Tail gas treatment system in crushing and sorting process of scrapped power lithium battery | |
| CN211635909U (en) | Papermaking alkali black liquor tail gas treatment system | |
| CN102191709B (en) | Recovery method for mixed alkalie in cotton pulp black liquor and reed pulp black liquor | |
| CN202207541U (en) | Desulfurization system used for treating flue gas of glass furnace | |
| CN206837841U (en) | A kind of SNCR denitration device for reducing biomass boiler nitrogen oxides in effluent | |
| CN111017959A (en) | Production method for improving production capacity of alkali furnace | |
| CN107051155B (en) | Method for preparing nitrate by using low-grade alkali-containing brine for flue gas desulfurization-oxidation | |
| CN215249709U (en) | Ammonia still waste liquid cyclic utilization's device | |
| CN101716459A (en) | Integrated method of boiler gas desulfurization and desulfurization waste liquid treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200410 |
|
| RJ01 | Rejection of invention patent application after publication |